STANTON.] 



ANOMIIDJE. 67 



comparison is secured, but as A. nitida comes from a considerably 

 higher horizon and the original description and figures show a differ- 

 ent outline, as well as differences in the surface characters, it is thought 

 best to treat them as distinct. . 



Anomia truncaia Geinitz, as figured by Beuss, 1 is very much like 



this species. 



Locality and position.— -In the Pugnellus sandstone on Williams creek, 



Huerfano park, Colorado. 



Anomia concentrica Meek. 



PI. vni, Fig. 7. 



Anomia concentrica Meek, 1860, Proc. Acad. Nat. Sci. PMla., vol. 12, p. 311;— 1876. 

 Simpson's Rept. Expl. across Great Basin of Utah, p. 359, PI. 4, Fig. 3. 



Original description: 



a Shell small, thin, subcircular or transversely a little oval; lateral 

 extremities nearly equally rounded; cardinal margin rather straight or 

 but slightly arched ; beak very small, central, compressed, marginal, 

 not projecting beyond the cardinal border; surface of upper valve 

 ornamented by moderately distinct regular, concentric undulations, 

 and much smaller obscure lines of growth. Transverse diameter 0.64 

 inch; length from hinge to the opposite margin 0.50 inch." 



Locality and position. — On Sulphur creek near Bear river, Wyoming, 

 in whitish sandstone associated with Inoceramus and Ostrea soleniscus. 

 I am not positive whether this comes from the bed containing J. labi- 

 atus and Pugnellus fusif or mis or from a somewhat higher horizon. 



Anomia propa/toris White $ 



PI. viii, Fig. 10. 



Anomia propatoris White, 1880, Contributions to Paleontology, Nos. 2-8, p. 14, PI. 12, 

 Figs. 15 a and 6, Ann. Rept. U. S. Geol. Sur. Terr, for 1878. 



"Shell rather small, irregular, and a little obliquely subovate or 

 subcircular in marginal outline; test pearlaceous and moderately thin as 

 is usual in Anomia. Upper valve convex; beak small, depressed, not 

 quite marginal; surface marked by somewhat coarse, irregular wrinkles 

 of growth, by a few radiating wrinkles in the umbonal region and by 

 fine, close-set, raised, radiating striae, the latter appearing more dis- 

 tinctly on the forward part of the shell than elsewhere. Under valve 

 unknown. 



"Length of the most perfect example in the collection, ll mm ; breadth, 

 10 m,n ; convexity, 5 mm . 



"This shell resembles A. gryphorliynclius Meek, the typical examples 

 of which are from the Laramie strata of the Bitter Creek series, south - 



1 Verstein Bolim. Kreidef., II, p. 45, pi. 31, Fig9. 12-14. 



